CSS Cubic Bezier Generator

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Design Custom Easing Curves with the CSS Cubic Bezier Generator

Animations make or break a user interface. A button that snaps into place feels robotic, while one that eases in with a gentle curve feels alive. The secret ingredient behind smooth CSS transitions is the cubic-bezier timing function, and our CSS Cubic Bezier Generator gives you a visual playground to craft the perfect curve without memorising coordinate values or guessing in code.

What Is a Cubic Bezier Curve?

In CSS, the cubic-bezier() function defines how an animation progresses over time. It takes four numbers, two control points, that shape a curve on a graph where the x-axis is time and the y-axis is progression. The built-in keywords ease, ease-in, ease-out, and ease-in-out are just named cubic-bezier values. When none of those presets feel right, you need to define your own.

Crafting a custom curve by typing numbers into your stylesheet is like tuning a guitar by guessing frequencies. You need visual feedback. This generator provides exactly that: drag the control points on an interactive graph, watch the preview animation update in real time, and copy the final cubic-bezier CSS value when the motion feels just right.

How to Use the Generator

The interface shows a square graph with a diagonal line representing linear progression. Two draggable handles control the shape of the curve. Pull the first handle down and right to create a slow start. Push the second handle up and left to create a fast finish. The preview element beside the graph animates continuously so you can evaluate the feel at a glance.

Below the graph, the tool displays the exact cubic-bezier(x1, y1, x2, y2) value, ready to paste into your CSS. It also shows the equivalent JavaScript easing function for developers who need to animate outside of CSS, in a canvas game engine or a React spring library, for instance.

Popular Easing Presets

Not sure where to start? The generator includes a library of popular easing presets inspired by the classic Robert Penner easing equations. Click any preset to load its control points onto the graph, then fine-tune from there. Presets include ease-in-quad, ease-out-cubic, ease-in-out-expo, and many more. Each one is labelled with a brief description of when it works best, whether for slide-in menus, modal fades, or bouncing notifications.

Why Custom Easing Makes a Difference

The default ease timing function is a safe choice, but it becomes monotonous when every element on the page uses it. Custom easing lets you establish a motion language for your brand. A fintech dashboard might use sharp, decisive curves that convey precision. A children's educational app might use playful overshoots that feel bouncy and fun. These subtle details compound into an overall experience that users notice even if they cannot articulate why one site feels better than another.

Performance is another reason to care. A well-chosen easing curve can make a 300-millisecond transition feel instantaneous because the early portion of the animation covers most of the visual distance. Users perceive the action as complete before the transition actually finishes, resulting in a snappier-feeling interface with no change in actual duration.

Export and Integrate

Copy the generated value directly into your transition-timing-function or animation-timing-function declarations. The tool also provides a full CSS snippet you can paste as-is. Everything runs in your browser with no server dependency, so your design experiments stay private and your workflow stays uninterrupted. Start shaping better animations today with the CSS cubic bezier generator.